Asparagus
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What is the asparagus plant genus?
The genus of the asparagus plant is Asparagus, which contains up to 300 species native to areas from Siberia to southern Africa. The best-known species is the garden asparagus (Asparagus officinalis), which is cultivated as a vegetable for its succulent spring stalks. Asparagus is part of the family Asparagaceae, which includes 153 genera and about 2,500 species of flowering plants.
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What does an asparagus plant look like?
An asparagus plant can be erect or climb, with most species being somewhat woody. From its rhizome-like or tuberous roots grow fern-like branchlets, while its true leaves are reduced to small scales.
Many asparagus species are dioecious, meaning individual plants are either male or female. In spring, they produce small greenish-yellow flowers, followed by red berries in the fall. Asparagus plants are further characterized by cladodes, which are leaf-like organs in the axils of the true leaves. If the thick, fleshy spears continue to grow, flat, green cladodes will develop in the axils of the scale leaves.
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Where does asparagus naturally grow in the world?
Asparagus, of the genus Asparagus, has up to 300 species native from Siberia to southern Africa. The garden asparagus (Asparagus officinalis) is cultivated in most temperate and subtropical parts of the world. In 2018, the worldās leading producers of asparagus were China, Peru, Mexico, Germany, and Thailand. Commercial plantations are not undertaken in regions where the plant continues to grow throughout the year, for the shoots become more spindly and less vigorous each year; a rest period is required.
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What are some different species in the asparagus genus?
The Asparagus genus, belonging to the family Asparagaceae, includes up to 300 species native from Siberia to southern Africa. While the garden asparagus (Asparagus officinalis) is the most well-known for its edible stalks, several other species are grown as ornamentals.
Some Asparagus species include floristās fern (A. setaceus), Sprengerās fern (A. aethiopicus), African asparagus fern (or bridal creeper, A. asparagoides), and asparagus fern (A. densiflorus).
Several Asparagus species face threats in their natural habitats. A. fallax and A. nesiotes are endangered due to habitat fragmentation in the Canary Islands, while A. arborescens and A. plocamoides are considered vulnerable. Other endangered species include A. kiusianus (Japan), A. sekukuniensis (South Africa), and A. usambarensis (Tanzania). A. macrorrhizus, a Spanish species, is critically endangered.
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How is asparagus grown and harvested as a food?
Asparagus, Asparagus officinalis, is grown in temperate and subtropical regions and has been enjoyed since Roman times. China, Peru, Mexico, Germany, and Thailand were the top asparagus producers in 2018.
Asparagus plantations need a rest period to remain productive for 10ā15 years. They thrive in deep, loose, light clays, with much organic matter, and light sandy loams but not in acidic soils. The cutting season ranges from 2 to 12 weeks, depending on the plantation's age and climate. While vegetable crops like asparagus are still largely harvested by hand, the scarcity and high cost of field labor has led to some mechanization in this area.
In France, asparagus is grown underground to inhibit chlorophyll development, yielding white asparagus prized for its tenderness and delicate flavor.
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What are some uses and benefits of asparagus plants besides eating?
Beyond their culinary use, certain asparagus species, though sometimes poisonous, are valued for their graceful foliage in floral arrangements. Asparagus setaceus, known as florist's fern, features feathery branchlets and is used in corsages. Other species like Asparagus aethiopicus, Asparagus asparagoides, and Asparagus densiflorus are cultivated as ornamentals for their lacy foliage. Asparagus sprengeri, also called emerald feather, is a commonly cultivated ornamental asparagus with wiry stems, pink blossoms, and red berries. However, several Asparagus species face threats in their natural habitats, with some listed as endangered or critically endangered due to habitat fragmentation.
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Asparagus, (genus Asparagus), genus of the family Asparagaceae with up to 300 species native from Siberia to southern Africa. Best known is the garden asparagus (Asparagus officinalis), cultivated as a vegetable for its succulent spring stalks. Several African species are grown as ornamental plants.
Physical description
Asparagus species may be erect or climbing, and most of the species are more or less woody. The rhizomelike, or sometimes tuberous, roots give rise to conspicuous fernlike branchlets. True leaves are reduced to small scales. Many species are dioecious (individuals are either male or female), and the small greenish yellow flowers in the spring are followed by red berries in the fall. Members of the genus are characterized by the presence of cladodes, which are leaflike organs in the axils of the true leaves.
Major species
Garden asparagus
Garden asparagus, the most economically important species of the genus, is cultivated in most temperate and subtropical parts of the world. As a vegetable, it has been prized by epicures since Roman times. It is most commonly served cooked, either hot or in salad; the classic accompaniment is hollandaise sauce. In 2018 the worldās leading producers of asparagus were China, Peru, Mexico, Germany, and Thailand. Commercial plantations are not undertaken in regions where the plant continues to grow throughout the year, for the shoots become more spindly and less vigorous each year; a rest period is required. Where the climate is favourable and with proper care, an asparagus plantation may be productive for 10 to 15 years or longer. The best soil types for asparagus are deep, loose, light clays, with much organic matter, and light sandy loams. Asparagus will thrive in soils too salty for other crops, but acidic soils are to be avoided. The asparagus cutting season varies from 2 to 12 weeks, depending on age of the plantation and on climate.
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In parts of France, most notably at Argenteuil, asparagus is customarily grown underground to inhibit development of chlorophyll. This white asparagus is prized for its tenderness and delicate flavour. In classic French culinary nomenclature, the word āArgenteuilā denotes an asparagus garnish.
Other species
Some poisonous species are prized for their delicate and graceful foliage. Floristās fern (A. setaceus) is not a true fern and has feathery sprays of branchlets often used in corsages and in other plant arrangements. Sprengerās fern (A. aethiopicus), African asparagus fern (or bridal creeper, A. asparagoides), and asparagus fern (A. densiflorus) are grown for their attractive lacy foliage and are common ornamentals.
Several species of Asparagus are threatened in their natural habitats. Habitat fragmentation in the Canary Islands has led to the listing of two species (A. fallax and A. nesiotes) as endangered and two (A. arborescens and A. plocamoides) as vulnerable. A. kiusianus of Japan, A. sekukuniensis of South Africa, and A. usambarensis of Tanzania are also listed as endangered, and a Spanish species, A. macrorrhizus, is critically endangered.